Mine come from Hobby Lobby - I always pick up 3 or 4 when they have their 40% off. I like them and they have an oversized place on the spine where you can put a list of what is in the book. Really like that!
I buy a lot from the Superstore - it is the best place to shop. But being honest, I do run to Hobby Lobby for my 3D-Ring binders 12 x 12 binders.